Evaporator



.TJ e e .n S w e e h s 2 R E W O R B H G. m. M M O m.

EVAPORATOR.

Patented Deo. 9,1890

fr.: cams frans nq., muro-mnowmsumawn. u.

2 Sheets-Sheet 2.

(No Model.)

G. H. BROWER.

BVAPORATOR.

No. 442,478. Patented Dec. 9, 1890.

INVENTO/i.

BY yall/WM .o. M S M/f/ n?. WIM

ATTORNEYS UNTTnn STATES PATENT OFFICE.

GEORGE ll. BROVER, OF ROANN, INDIANA.

EVAPO RATO R.

SPECIFICATION forming part of Letters Patent No. 442,478, dated Dezember 9, 1890.

Serial No. 314,805. (No model.)

Application filed .Tune 19, 1889.

To a/ZZ whom t may concern:

Be it known that I, GEORGE H. Baewnn, of Roann, in the county oi' \Vabash and Stateot Indiana, have invented a new and Improved Evaporator, of which the following a full, clear, and exact description.

The object of the invention is to provide a new and improved evaporator for rapidly and effectively producing pure sirup from saccharine juices.

The invention consists of certain parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming apart et this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a plan view of the evaporator. Fig. 2 is a sectionalside elevation of the same on the line cc a: of Fig. l. Fig. 3 is a like view of the same on the line y je] of Fig. l. Fig. et is a transverse section on line u: w of Fig. l. Fig. is a similar section on line `r r of Fig. l. Fig'. G is a similar view on linen n, Fig. l. Fig. 7 is a perspective view of oneof the pans of the strainer.

The improved evaporator is provided with a pan A, set in a suitable foundation and provided with partitions B, B', and B2, dividing the pan into several compartments C, D, E, and F. Under the evaporator is located a furnace G ot any approved construction and serving to heat the contents ot the pan A throughout its length. As shown by dotted lines in Fig. l, the front of the furnace G is narrower than the pan A by the width ot' t-he passage-ways l2. In other words, the latter overhang the sides of the furnace, and are hence not heated so highly as the intervening middle portion of compartment (l. The furnace has the usual exit and chimney at its rear end, as shown in Fig. Q. Each of the partitions B, B', and B2 is provided in its middle at the bottom with an opening B3, adapted to be closed by a gate Bi, mounted to slide vertically in suitable guideways formed in the respective partitions. The openings BS in the partitions B, B', and .B2 serve to connect the adjoining compartments with each other. A trough H is arranged on each side of compartment D, and

the walls D form the inner sides ot such troughs, as shown. The bottoms Il' of the latter are inclined from rear to front, (see Fig. 55 3,) and, passing through an opening H2 in partition B, extend forward alongside compartment C. A passage-way 12 is formed on each side of compartment C by means of a metallic sheet I', which isinclined outward from 6o the bottom, shown in Figs. l and i. These passage-ways l2 are open at the front endand communicate byopenings ll2 (in partition B) with the troughs ll, placed alongside the second compartment D.

The walls E of the compartment E are provided on top with steps El, extending longitudinally and downward to the. outside, Fig. 5. A trough Lis arranged on each side of compartment E, and the walls E of the lat- 7o ter form the inner sides ot' the troughs. Each of the latter has au inclined bottom L', extending from the partition -B2 downward to the partition B. Atthe lower end of each inclined bottom L' is formed an aperture F.3 75 in the respective walls E', so that the lower end of each trough L is in communication with the compartment E.

The compartment F has its walls F provided with steps FQ, similar to the steps E2. So Onthe outside of each wall F' is formed a trough N, provided with an inclined bottom N', extending from the rear end of the pan A downward to the partition B2. An aperture F;3 in each wall F' connects the lower end of 85 the trough N with the interior of the compartment F.

On the front end et the compartment C is held an upwardly-curved and transverselyextending perforated partition-plate O, con- 9o necting at its upper end with a perforated trough P, extending transversely and leading to one side of the pan A and serving to carry off the scum. A filter Q. discharges into the first compartment C and comprises a number 95 of filtering-pans R, cach provided with a bottom made partly solid at its upper end R and formed partly of a sieve R2, below which is held a solid bottom R3, closed at its upper end and opening at its lower end, as shown in roo Fig. 7. The several pans R are placed in an inclined position, and the succeeding ones extend in opposite directions, as is plainly shown in Fig. 2. By this arrangement the lowerend of the sieve R2 and its fixed bottomR3 discharge onto the fixed bottom R of the next following pan. The lowermost pan R dis- .charges into the compartment C, while the uppermost pan is connected with a tank S, containing the juice. The juice passing from the tank S through the filter Q is thus filtered before entering the compartment C.

The operation is as follows: The cold juice enters in a constant stream the front end of the compartment C after it has passed YVthrough the filter Q. The gate B4 in the par- 1ition B is closed, so that the compartments E and F are in communication with each other, and said compartments are wholly or partly filled with water. The gate l?)4 in the `partition B is open7 so that the juice entering` the compartment O can fiow into the compartment D. The juice in the compartments C and D is subjected to the heat arising from the furnace G until it is well purified and reduced to about 2OC to 25 Baume. As the juice passes backward toward the compartment D it boils up and throws the coarser impurities toward the forward end of the compartment, where it is kept from boiling by the entering cold juice, aided by the lower temperature of the passage I2 on each side of the compartment C. rlhe juice then passes through the opening B3 in the partition B to the compartment D, from which a portion boils over into the side troughs, carrying the scum and etherimpurities with it. Thejuice in the troughs is somewhat condensed and flows forward through the openings in the partition B into'the passage I2 and from the latter to the front end of the compartment C, in which is formed a quiet space by the cold juice coming from the filter Q, so that the scum and other impurities can be skimmed as often as desired, the sirup passing back into compartment A, as above described.

In regard to the passages l2, it will be understood that as they are straight they carry the overflow of compartment D to the com` partment without clogging. As soon as the overfiow passes from the troughs into the passages l2 it is heated, as the metal cover I of each passage is surrounded by the boiling juice in the compartment C, and consequently the sirup passing through the passage I2 is heated to a boiling-point when it enters the compartment C. As the passages I2 are steamiight, they aid in the coagulation of the scum, and as they absorb considerable heat from the boiling juice the latter is prevented from boiling over the sides of the compartment C. Y The boiling of the juice is confined more to the middle of the compartment C, as the entering of the cold juice from the filter Q, aided by the absorption of heat by the passages 12, forms a quiet space in the front end of the compartment() for the collection of the scum from the compartment C and from the closed passages I2, as before described. The scum is raked into the perforated trough or strainer P, and any juice raked into the same with the scum passes back into the compartment C by the perforations in the bottom of the trough P. Then the sirup in the compartment D has been reduced to 20 to 25o Baume, the water in the compartment E is transferred to the compartment F, and the sirup is admitted'to the compartment E by opening the gate B4 in the partition B. Enough sirup is admitted to fill the compartment E to the depth of about one and onehalf inch, after which the gate is again closed. The heat being greatest in the middle of the pan, the sirup boils most violently there, and fiows laterally, carrying the scum over the walls E into the side troughs. In so doin'g the sirup passes over the steps E2 and is exposed to the air for a slightly longer time than it would be in the absence of such steps. Hence the sirup that enters the side troughs is cooled and condensed, so that it has greater specific gravity, and therefore flows back again through holes Es in walls E into the same compartment from which it came. Thus the scum is for the most part removed and collected and retained in the side troughs. The sirup from the compartment is finally transferred to compartment F, the water in the latter being previously removed, through thegateB* in partition B2 being' first opened and then closed. The compartment E is then filled as before. The sirups in the compartments E and F are at all times kept separate.

The treatmentof the sirup in the finishingcompartment F is the same as in the other compartment, and the .finished sirup is finally run out through the opening F4.

The perforated plate O, joined totrough P, aids in straining any juice passing over it when the scum is raked into the trough P.Y

Having thus fully described my invention, I claimA as new and desire to secure by Letters Patent- I. The combinatiolnwith the compartment E, of side troughs L L and sides E', having their top edges constructed in steps, as and for the purpose specified.

2. In an evaporator, the combination, with the compartment C, compartment D, and side troughs hav-ing openings at the front end, of the passage-ways l2, having metal covers and inclined bottoms, substantially as shown and described,

GEORGE II. BROVER.

VitneSSes:

' JOHN W. TAYLOR,

H. L. ROBERTSON.

IOO

IIO 

